CN104234880A - Intake temperature control systems and methods for intake manifold protection - Google Patents

Intake temperature control systems and methods for intake manifold protection Download PDF

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Publication number
CN104234880A
CN104234880A CN201410269112.7A CN201410269112A CN104234880A CN 104234880 A CN104234880 A CN 104234880A CN 201410269112 A CN201410269112 A CN 201410269112A CN 104234880 A CN104234880 A CN 104234880A
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China
Prior art keywords
temperature
egr
predetermined
gas
predetermined temperature
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Granted
Application number
CN201410269112.7A
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Chinese (zh)
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CN104234880B (en
Inventor
B.J.宋
G.J.约克
J.C.瓦斯伯格
J.J.科赖亚
T.W.阿塞恩
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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Priority to US13/919,236 priority Critical patent/US9353694B2/en
Priority to US13/919236 priority
Application filed by GM Global Technology Operations LLC filed Critical GM Global Technology Operations LLC
Publication of CN104234880A publication Critical patent/CN104234880A/en
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Publication of CN104234880B publication Critical patent/CN104234880B/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047Controlling exhaust gas recirculation [EGR]
    • F02D41/005Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • F02D41/0052Feedback control of engine parameters, e.g. for control of air/fuel ratio or intake air amount
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047Controlling exhaust gas recirculation [EGR]
    • F02D41/005Controlling exhaust gas recirculation [EGR] according to engine operating conditions
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/02Circuit arrangements for generating control signals
    • F02D41/14Introducing closed-loop corrections
    • F02D41/1438Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1439Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the position of the sensor
    • F02D41/1441Plural sensors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D9/00Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201Arrangements; Control features; Details thereof
    • F02D2009/0277Fail-safe mechanisms, e.g. with limp-home feature, to close throttle if actuator fails, or if control cable sticks or breaks
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047Controlling exhaust gas recirculation [EGR]
    • F02D41/0065Specific aspects of external EGR control
    • F02D2041/0067Determining the EGR temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/04Engine intake system parameters
    • F02D2200/0402Engine intake system parameters the parameter being determined by using a model of the engine intake or its components
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/04Engine intake system parameters
    • F02D2200/0414Air temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D2200/00Input parameters for engine control
    • F02D2200/02Input parameters for engine control the parameters being related to the engine
    • F02D2200/04Engine intake system parameters
    • F02D2200/0414Air temperature
    • F02D2200/0416Estimation of air temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/0025Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D41/0047Controlling exhaust gas recirculation [EGR]
    • F02D41/0065Specific aspects of external EGR control
    • F02D41/0072Estimating, calculating or determining the EGR rate, amount or flow
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

The invention relates to an intake temperature control systems and methods for intake manifold protection. An engine control system of a vehicle includes a first temperature module, a second temperature module, and an exhaust gas recirculation (EGR) control module. The first temperature module determines a temperature of gas within an intake manifold of an engine. The second temperature module determines a temperature of an EGR conduit that is coupled to the intake manifold. The EGR control module reduces opening of an EGR valve when the temperature of the gas and the temperature of the conduit is greater than a predetermined temperature.

Description

Intake temperature control system and the method for intake manifold protection
Technical field
The present invention relates to a kind of explosive motor and relate more specifically to a kind of intake temperature control system and method.
Background technique
In the object that the description of this background technique provided is for introducing background of the present invention generally.The work of the inventor of current signature, the degree described in the background section, and can not be considered to when submitting in the specification of prior art in, be not only impliedly considered to prior art of the present invention of conflicting ambiguously but also not.
Engine combustion air and fuel are to produce moment of torsion.Air is by gas handling system inflow engine.Gas handling system can comprise throttle valve and intake manifold.Fuel is provided by one or more fuel injector.Engine output torque is to speed changer.Speed changer transmitting torque is to one or more wheel.The exhaust produced by burning is discharged to vent systems from motor.
Exhaust gas recirculatioon is got back to gas handling system by exhaust gas recirculatioon (EGR) system.For the exhaust flowing back into gas handling system, the pressure in vent systems must be greater than the pressure that exhaust enters gas handling system place.Egr system can be controlled such that exhaust, and the target mixture of air and fuel is provided to each cylinder.
Summary of the invention
In feature, the engine control system of vehicle comprises the first thermal module, the second thermal module, and exhaust gas recirculatioon (EGR) control module.The temperature of gas in the intake manifold of the first thermal module determination motor.Second thermal module determines the temperature of the EGR conduit be connected in intake manifold.When the temperature of gas and the temperature of conduit are greater than predetermined temperature, EGR control module reduces the aperture of EGR valve.
In further feature, predetermined temperature corresponds to the melting point of intake manifold.
In further feature, when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module reduces the aperture of EGR valve to predetermined aperture.
In further feature, when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module closes EGR valve completely.
In further feature, when gas temperature and conduit temperature are greater than predetermined temperature at predetermined period, EGR control module reduces the aperture of EGR valve.
In further feature, EGR control module reduces the aperture of EGR valve until gas temperature and conduit temperature are less than the second predetermined temperature, and described second predetermined temperature is less than predetermined temperature.
In further feature, EGR control module reduces the aperture of EGR valve, until gas temperature and conduit temperature are less than the second predetermined temperature at predetermined period.
In further feature, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, freezing mixture control module carries out opening in the speed of electronic coolant pump and the electronic coolant pump of increase, and described 3rd predetermined temperature is less than predetermined temperature.
In further feature, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, freezing mixture control module opens electric thermostat valve, and described 3rd predetermined temperature is less than predetermined temperature.
In further feature, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, venetian blind control module opens the Pneumatic shutters of vehicle, and described 3rd predetermined temperature is less than predetermined temperature.
In feature, the engine control for vehicle comprises: the temperature determining the gas in the intake manifold of motor; Determine the temperature of exhaust gas recirculatioon (EGR) conduit be connected in intake manifold; And the aperture of EGR valve is reduced when the temperature of gas and the temperature of conduit are greater than predetermined temperature.
In further feature, predetermined temperature corresponds to the melting point of intake manifold.
In further feature, engine control comprises when gas temperature and conduit temperature are greater than predetermined temperature further, reduces the aperture of EGR valve to predetermined aperture.
In further feature, engine control comprises further when gas temperature and conduit temperature are greater than predetermined temperature, closes EGR valve completely.
In further feature, engine control comprises when gas temperature and conduit temperature are greater than predetermined temperature at predetermined period further, reduces the aperture of EGR valve.
In further feature, engine control comprises the aperture of reduction EGR valve further until gas temperature and conduit temperature are less than the second predetermined temperature, and described second predetermined temperature is less than predetermined temperature.
In further feature, engine control comprises the aperture of reduction EGR valve further until gas temperature and conduit temperature are less than the second predetermined temperature at predetermined period.
In further feature, engine control comprises when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature further, and described 3rd predetermined temperature is less than predetermined temperature, carry out wherein at least one: open electronic coolant pump; With the speed increasing electronic coolant pump.
In further feature, engine control comprises further opens electric thermostat valve when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, and described 3rd predetermined temperature is less than predetermined temperature.
In further feature, engine control comprises further when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, opens the Pneumatic shutters of vehicle, and described 3rd predetermined temperature is less than predetermined temperature.
From detailed description, in claims and accompanying drawing, the further field of application of the present invention will become apparent.Detailed description and concrete example are only exemplary purpose and are not intended to limit the scope of the invention.
Present invention also offers following scheme:
1. an engine control system for vehicle, comprising:
First thermal module, it determines the gas temperature in the intake manifold of motor;
Second thermal module, it determines exhaust gas recirculatioon (EGR) conduit temperature be connected in intake manifold; And
EGR control module, it reduces the aperture of EGR valve when gas temperature and conduit temperature are greater than predetermined temperature.
2. the engine control system according to scheme 1, wherein predetermined temperature corresponds to the melting point of intake manifold.
3. the engine control system according to scheme 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module reduces the aperture of EGR valve to predetermined aperture.
4. the engine control system according to scheme 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module closes EGR valve completely.
5. the engine control system according to scheme 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature at predetermined period, EGR control module reduces the aperture of EGR valve.
6. the engine control system according to scheme 1, wherein EGR control module reduces the aperture of EGR valve until gas temperature and conduit temperature are less than the second predetermined temperature, and described second predetermined temperature is less than the first predetermined temperature.
7. the engine control system according to scheme 6, wherein EGR control module reduces the aperture of EGR valve until gas temperature and conduit temperature are less than the second predetermined temperature at predetermined period.
8. the engine control system according to scheme 1, it comprises freezing mixture control module further, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described freezing mixture control module at least carries out opening in the speed of electronic coolant pump and the electronic coolant pump of increase, and described 3rd predetermined temperature is less than predetermined temperature.
9. the engine control system according to scheme 1, it comprises freezing mixture control module further, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described freezing mixture control module opens electric thermostat valve, and described 3rd predetermined temperature is less than predetermined temperature.
10. the engine control system according to scheme 1, it comprises venetian blind control module further, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described venetian blind control module opens the Pneumatic shutters of vehicle, and described 3rd predetermined temperature is less than predetermined temperature.
The engine control of 11. 1 kinds of vehicles, comprising:
Determine the gas temperature in the intake manifold of motor;
Determine exhaust gas recirculatioon (EGR) conduit temperature be connected in intake manifold; And
The aperture of EGR valve is reduced when gas temperature and conduit temperature are greater than predetermined temperature.
12. engine controls according to scheme 11, wherein predetermined temperature corresponds to the melting point of intake manifold.
13. engine controls according to scheme 11, it comprises when gas temperature and conduit temperature are greater than predetermined temperature further, reduces the aperture of EGR valve to predetermined aperture.
14. engine controls according to scheme 11, it comprises further when gas temperature and conduit temperature are greater than predetermined temperature, fully closes EGR valve.
15. engine controls according to scheme 11, it comprises when gas temperature and conduit temperature are greater than predetermined temperature at predetermined period further, reduces the aperture of EGR valve.
16. engine controls according to scheme 11, its comprise further reduce EGR valve aperture until gas temperature and conduit temperature are less than the second predetermined temperature, described second predetermined temperature is less than predetermined temperature.
17. engine controls according to scheme 16, its comprise further reduce EGR valve aperture until gas temperature and conduit temperature are less than the second predetermined temperature at predetermined period.
18. engine controls according to scheme 11, it comprises further, and when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described 3rd predetermined temperature is less than predetermined temperature, carry out following at least one:
Open electronic coolant pump; And
Increase the speed of electronic coolant pump.
19. engine controls according to scheme 11, it comprises further opens electric thermostat valve when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, and described 3rd predetermined temperature is less than predetermined temperature.
20. engine controls according to scheme 11, it comprises the Pneumatic shutters opening vehicle when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature further, and described 3rd predetermined temperature is less than predetermined temperature.
Accompanying drawing explanation
From detailed description and accompanying drawing, the present invention will become and understand more completely, wherein:
Fig. 1 is the functional block diagram according to exemplary engine system of the present invention;
Fig. 2 is the functional block diagram according to exemplary engine control system of the present invention;
Fig. 3 is the functional block diagram reducing module according to exemplary temperature of the present invention;
Fig. 4 depicts the flow chart of the illustrative methods according to control MAT of the present invention; And
Fig. 5 depicts the flow chart of deactivation command according to the present invention for reducing the illustrative methods of the minimizing of the exhaust gas recirculatioon of MAT.
In accompanying drawing, reference character can be recycled and reused for and refer to phase class and/or identical element.
Embodiment
Air in engine combustion cylinder and fuel are to produce the driving torque being used for vehicle.Motor by gas handling system by air intake cylinder.Gas handling system comprises throttle valve and intake manifold.What motor output was produced by burning is vented to vent systems.Exhaust is returned gas handling system from vent systems recirculation by exhaust gas recirculatioon (EGR) system, such as intake manifold.
In order to reduce quality, intake manifold can comprise one or more plastic article.But in some environments, intake manifold may stand high temperature, and intake manifold may melt and/or loss structure integrity.Such as, when ambient air is heat, when there is high engine loads condition, and/or when the efficiency of cooler (such as, charge cooler and/or cooler for recycled exhaust gas) reduces, intake manifold may stand high temperature.Such as, when the cooling medium (such as, freezing mixture and/or air) by cooler flowing reduce or be zero time, the efficiency of cooler may reduce.
Engine control module (ECM) of the present invention estimates the temperature of the gas in intake manifold.ECM also estimates the temperature of the metal EGR conduit being connected to intake manifold.When the temperature of gas and/or the temperature of EGR conduit are greater than the predetermined temperature that intake manifold may melt and/or damage, ECM lowers EGR flow.ECM also can take other remedial measure one or more with the temperature of the temperature and EGR conduit that reduce gas selectively, such as, increase the speed of electronic coolant pump, open electromic thermostat valve, and/or open Pneumatic shutters.
Referring now to Fig. 1, present the functional block diagram of exemplary engine system 10.Although engine system 10 will according to spark ignition engine System Discussion, the application is also suitable for the engine system of other type, such as pressing combustion type engine system and hybrid power engine system.
Air sucks motor 8 by the gas handling system comprising throttle valve 12 and intake manifold 14.Throttle valve 12 can regulate the air-flow entering intake manifold 14.Intake manifold 14 comprises one or more plastic article or is made up of one or more plastic article.Throttle actuator module 16 controls the actuating of throttle valve 12.Air/fuel mixture in the cylinder of motor 8 combustion engine 8.Fuel system 17 selectively burner oil to motor 8.Ignition system 19 provides spark to motor 8 selectively for burning.
The burning driving crank of air/fuel mixture and generation exhaust.Motor 8 exports and is vented to gas exhaust manifold 18.One or more exhaust gas treatment device, such as catalyzer, can react with the heterogeneity of exhaust.Be only exemplary, catalyzer can comprise ternary catalyzing unit (TWC), catalytic converter, or the catalyst converter of other suitable type.
Some engine systems, the exemplary engine system of such as Fig. 1, comprises turbosupercharger.Turbosupercharger comprises turbo machine 20 and compressor 22.The rotation of the exhaust gas driven turbine machine 20 exported by motor 8.Turbo machine 20 is mechanically connected with compressor 22 thus turbo machine 20 drives the rotation of compressor 22.Compressor 22 pressurization is provided to the air of intake manifold 14.Some engine systems can comprise multiple (such as, two) turbosupercharger.
Turbine bypass valve 24 controls the exhaust air flow of bypass turbine 20.Supercharging actuator module 26 controls turbine bypass valve 24.The exhaust of bypass turbine 20 is decreased through the exhaust air flow of turbo machine 20 and the output because this reducing compressor 22.In various embodiments, turbine bypass valve 24 is replaced to implement wastegate.
Charge cooler 28, such as charge air cooler (CAC) or interstage cooler, cool the air exported from compressor 22.Such as, CAC transmits since the heat of the air of compressor 22 output is to the air flowed by CAC.The heat of the air that interstage cooler transmission exports since compressor 22 to the freezing mixture flowed by interstage cooler, such as engine coolant.In some engine systems with one or more turbosupercharger, charge cooler 28 can omit.In the engine system not having turbosupercharger, turbo machine 20 can be omitted, compressor 22, turbine bypass valve 24, and charge cooler 28.
Exhaust gas recirculatioon is got back to gas handling system by EGR valve 30, such as intake manifold 14.Exhaust recirculation can be back to other suitable position, the such as upstream of compressor 22 in gas handling system.EGR actuator module 32 controls EGR valve 30.Cooler for recycled exhaust gas 34 may be embodied as the exhaust that cooling recirculation is back to gas handling system.The cooler bypass system (not shown) comprising cooler for recycled exhaust gas bypass valve may be embodied as the exhaust controlling bypass cooler for recycled exhaust gas 34.Due to the high temperature of exhaust, be vented the conduit getting back to gas handling system by its recirculation and comprise metal.
Engine control module (ECM) 40 regulates the work of engine system 10.Such as, ECM 40 controls opening of throttle valve 12 via throttle actuator module 16, opening of EGR valve is controlled via EGR actuator module 32, fuel injection amount and timing is controlled via fuel system, control ignition timing via ignition system 19, and control the output of turbosupercharger via supercharging actuator module 26.ECM 40 can also control the work of air inlet and exhaust valve actuators and/or other suitable engine actuators one or more.
ECM 40 and each sensor, such as manifold absolute pressure (MAP) sensor 50, crankshaft position sensor 52, coolant temperature sensor 54, air temperature sensor 56, is communicated with exhaust gas temperature sensor 57.MAP sensor 50 produces the MAP signal of the absolute pressure represented in intake manifold 14.Crankshaft position sensor 52 produces signal based on the rotation of bent axle.Engine speed, with rpm (RPM) for unit, can determine based on the rotation of bent axle.
Coolant temperature sensor 54 produces the coolant temperature signal representing engineer coolant temperature, such as, in the temperature of the freezing mixture of the coolant outlet of motor 8.Air temperature sensor 56 produces air temperature signal based on the temperature of ambient air.Exhaust gas temperature sensor 57 produces exhaust temperature signal based on the temperature of exhaust.
Engine system 10 can also comprise other sensor 58 one or more.Other sensor 58 such as can comprise mass air flow (MAF) sensor, charge cooler output temperature sensor, cooler for recycled exhaust gas output temperature sensor, oil temperature sensor, intake air temperature sensor, and/or the sensor of other suitable type.
Referring now to Fig. 2, present the functional block diagram of the illustrative embodiments of ECM 40.Torque request module 102 inputs 106 based on one or more driver, such as accelerator pedal position, brake pedal position, and cruise control inputs, and/or torque request 104 is determined in other suitable driver one or more input.Torque request module 102 can additionally or alternatively based on other torque request one or more, the torque request such as produced by ECM 40 and/or other module from vehicle, such as transmission control module, mixed power control module, the request that chassis control module etc. receive, determines torque request 104.
Can based on torque request 104 and/or the one or more engine actuators of other vehicle operation state modulator one or more.Such as, throttle control module 112 can determine target throttle aperture 116 based on torque request 104.Throttle actuator module 16 based target throttle opening 116 regulates the aperture of throttle valve 12.Spark control module 120 can determine target spark timing 124 based on torque request 104.Ignition system 19 based target spark timing 124 produces spark.
Fuel control module 128 can determine one or more target fueling parameter 132 based on torque request 104.Such as, target fueling parameter 132 can comprise fuel injection pulses number (every combustion incident), the timing of every subpulse, and the amount of every subpulse.Fuel system 17 based target fueling parameter 132 burner oil.
Pressurization control module 136 can determine target supercharge 140 based on torque request 104.Supercharging actuator module 26 based target supercharging 140 regulates the aperture of turbine bypass valve 24 to make compressor 22 realize target supercharging 140.EGR control module 144 can determine target EGR aperture 148 based on torque request 104.EGR actuator module 32 based target EGR aperture 148 regulates the aperture of EGR valve 30.
In some cases, temperature reduces module 152(also see Fig. 3) produce the first reduction heat command 156 to reduce one or more temperature of intake manifold 14.Such as, when MAT is greater than predetermined temperature, temperature reduction module 152 can produce the first reduction heat command 156.When MAT is greater than predetermined temperature, intake manifold 14 may melt and/or loss structure integrity.
Referring now to Fig. 3, present the functional block diagram that temperature reduces the illustrative embodiments of module 152.Gas temperature module 204 determines air inlet (manifold) gas temperature 208.Intake temperature 208 can correspond to the temperature of the gaseous mixture in intake manifold 14.
For non-supercharged engine, gas temperature module 204 based on ambient temperature 212, cooler for recycled exhaust gas outlet temperature 216, and EGR mass fraction 220 determines intake temperature 208.Such as, gas temperature module 204 can use equation determination intake temperature 208:
Wherein IM Gas Temp is intake temperature 208, EGR Cooler Out Temp be cooler for recycled exhaust gas outlet temperature 216, Amb Temp is ambient temperature 212, and EGR Mass Fraction is EGR mass fraction 220.Ambient temperature 212 can Environmental Conditions air temperature sensor 56 be measured.As hereafter discussed, cooler for recycled exhaust gas outlet temperature 216 can use sensor measurement or determine.As hereafter discussed, EGR mass fraction 220 can be value between 0.0 and 1.0 (corresponding to percent 0 and percent 100) and can determined.
Cooler for recycled exhaust gas thermal module 224 can determine cooler for recycled exhaust gas outlet temperature 216.Cooler for recycled exhaust gas outlet temperature 216 can refer to the temperature in the outlet port at cooler for recycled exhaust gas 34.Cooler for recycled exhaust gas thermal module 224 can based on delivery temperature 228, coolant temperature 232, and the efficiency determination cooler for recycled exhaust gas outlet temperature 216 of cooler for recycled exhaust gas 34.Such as, cooler for recycled exhaust gas thermal module 224 can use equation determination cooler for recycled exhaust gas outlet temperature 216:
The efficiency of wherein EGR Cooler Out Temp is cooler for recycled exhaust gas outlet temperature 216, Exh Temp to be delivery temperature 228, Cooler Eff be cooler for recycled exhaust gas 34, and Coolant Temp is coolant temperature 232.Delivery temperature 228 such as can use exhaust gas temperature sensor 57 to measure or determine based on other parameter one or more.Coolant temperature 232 such as can use coolant temperature sensor 52 to measure.Cooler for recycled exhaust gas efficiency can start to be set to predetermined maximum (such as, about 1.0), and along with cooler for recycled exhaust gas 34 aging, cooler for recycled exhaust gas thermal module 224 can reduce cooler for recycled exhaust gas efficiency in time selectively.
EGR determination module 236 determines EGR mass fraction 220.EGR mass fraction 220 can correspond to EGR relative to the mass fraction of the expectation of (always) quality of the gas charge of future (such as, the next time) combustion incident of motor 8 or the EGR mass fraction relative to the gross mass of the gas in intake manifold 14.
EGR determination module 236 can determine (SS) EGR flow of stable state.SS EGR flow corresponds to the mass flow rate of getting back to the EGR of intake manifold 14 under SS EGR condition.SS EGR condition can refer to when the cycle of SS EGR flow when predetermined period change is less than prearranging quatity.
EGR determination module 236 can use relation to determine SS EGR flow:
Wherein ( ) be via egr system (that is, SS EGR flow) get back to the EGR of motor 8 (current) mass flow rate and be EGR valve 30 opening area ( ) 240, the pressure of EGR valve 30 upstream ( ), temperature ( ) (such as, delivery temperature 228), the pressure in EGR valve 30 downstream ( ) (such as, the pressure 244 in intake manifold 14), and each constant ( , , ) function.This relation may be embodied as equation, such as, equation above, or makes the mapping (such as look-up table) that above-mentioned parameter is relevant to SS EGR flow.Pressure 244 in intake manifold 14 can use MAP sensor 50 to measure.EGR position transducer can measure the position of EGR valve 30, and the opening area 240 of EGR valve 30 can be determined based on the position of EGR valve 30.
For each combustion incident of motor 8, gas charge is inhaled into cylinder.Gas charge can comprise: the ambient air aspirated by throttle valve 12; And to circulate the exhaust returned via egr system.Gas charge can also comprise other gas one or more, the fuel vapour such as provided by evaporative emission control system (not shown).
EGR determination module 236 determines the SS EGR mark of next combustion incident of motor 8.SS EGR mark corresponds to the mass fraction of the EGR under the SS EGR condition of the quality of the gas charge at next combustion incident being adapted to motor 8.EGR determination module 236 determines the SS EGR mark of next combustion incident based on SS EGR flow and the Mass Air Flow (MAF) 248 entering intake manifold 14.MAF 248 can use maf sensor to measure.EGR determination module 236 can such as use equation to determine the SS EGR mark of next combustion incident:
Wherein SSFraction be SS EGR mark and be SS EGR flow ( ) and MAF( ) 248 function.
EGR determination module 236 can comprise buffer circle, first in first out (FIFO) buffer, sift register etc.EGR determination module 236 comprises the nearest determined value of the SS EGR mark of predetermined number.When determining SS EGR mark, EGR determination module 236 stores SS EGR mark and removes the oldest storing value of SS EGR mark at every turn.
EGR determination module 236 determines the EGR mass fraction 220 of next combustion incident of motor 8 based on multiple storing values of SS EGR mark.EGR determination module 236 can based on the mean value of multiple storing values of SS EGR mark, and such as weighted mean value determines the EGR mass fraction 220 of next combustion incident.Value for the SS EGR mark determining EGR mass fraction 220 can be the value determined recently/store.
EGR determination module 236 can such as use equation to determine the SS EGR mass fraction 220 of next combustion incident:
Wherein EGRFraction is EGR mass fraction 220, t be motor 8 combustion incident and after transient state EGR condition occurs EGR mass fraction 220 will arrive SS(and therefore equal SS EGR mark) combustion incident subsequently between the number of combustion incident, d is when making by combustion incident when producing the order of transient state EGR condition and when EGR mass fraction 220 is by the number in response to the combustion incident of ordering between the combustion incident subsequently that starts when changing, and SSFrac refer to for t-1-i combustion incident before combustion incident SS EGR mark storing value in that, t and d is integer, and d is less than t.EGR transient condition such as can in response to the change in the aperture of closure 12, the change in the aperture of EGR valve 30, the change of intake manifold 14 internal pressure, or produces other the suitable event of the change got back in the mass flow rate of the EGR of gas handling system and occur.
In each mode of execution, t and d can be the volume of physically based deformation factor, such as cylinder volume, intake manifold 14, and the steady state value calibrated is carried out in exhaust by the volume of its egr system of advancing when recirculation.In each mode of execution, t and/or d can be variate-value and can be arranged by EGR determination module 236.EGR determination module 236 can arrange t and/or d, such as, use one or more function or make engine loading parameter, such as every cylinder air quantity (APC), and/or the mapping that engine speed 252 is relevant to t and/or d.One or more function or map can physically based deformation factor, such as cylinder volume, the volume of intake manifold 14, and the volume of egr system is calibrated.
For the engine system with turbosupercharger, the exemplary engine system of such as Fig. 1, gas temperature module 204 can based on cooler for recycled exhaust gas outlet temperature 216, charge cooler outlet temperature 256, and EGR mass fraction 220 determines intake temperature 208.Such as, gas temperature module 204 can use equation determination intake temperature 208:
Wherein IM Gas Temp is intake temperature 208, EGR Cooler Out Temp be cooler for recycled exhaust gas outlet temperature 216, Charge Cooler Outlet Temp is charge cooler outlet temperature 256, and EGR Mass Fraction is EGR mass fraction 220.As hereafter discussed, such as charge cooler outlet temperature 256 can use sensor measurement or determine.Charge cooler outlet temperature 256 can correspond to the temperature in the outlet port of charge cooler 28.
Charge chiller temperature module 260 can determine charge cooler outlet temperature 256.For the engine system that charge cooler 28 is interstage coolers, charge chiller temperature module 260 can based on compressor exit temperature 264, the efficiency determination charge cooler outlet temperature 256 of coolant temperature 232 and interstage cooler.Such as, charge chiller temperature module 260 can use equation to determine comprising the charge cooler outlet temperature 256 of the engine system of interstage cooler:
Wherein Charge Cooler Out Temp is charge cooler outlet temperature 256, Comp Out Temp be compressor exit temperature 264, Coolant Temp is coolant temperature 232, and Charge Cooler Eff is the efficiency of interstage cooler.Charge chiller efficiency can start to be set to predetermined maximum (such as, about 1.0), and along with interstage cooler aging, charge chiller temperature module 260 can reduce charge chiller efficiency in time selectively.Compressor exit temperature 264 such as can use sensor measurement.Compressor exit temperature 264 can correspond to the temperature in the outlet port of compressor 22.
For the engine system that charge cooler 28 is charge air cooler (CAC), charge chiller temperature module 260 can based on compressor exit temperature 264, ambient temperature 212, and the efficiency determination charge cooler outlet temperature 256 of CAC.Such as, charge chiller temperature module 260 can use equation to determine comprising the charge cooler outlet temperature 256 of the engine system of CAC:
Wherein Charge Cooler Out Temp is charge cooler outlet temperature 256, Comp Out Temp be compressor exit temperature 264, Amb Temp is ambient temperature 212, and Charge Cooler Eff is the efficiency of CAC.Charge chiller efficiency can start to be set to predetermined maximum (such as, about 1.0), and along with CAC aging, charge chiller temperature module 260 can reduce charge chiller efficiency in time selectively.
EGR is arranged on to the engine system of the upstream of compressor 22, charge chiller temperature module 260 can determine charge cooler outlet temperature 256 based on EGR mass fraction 220 and cooler for recycled exhaust gas outlet temperature 216 further.Such as, charge chiller temperature module 260 equation can be used to determine charge cooler outlet temperature 256 that EGR is arranged on the engine system of the upstream of compressor 22:
Wherein Charge Cooler Out Temp is charge cooler outlet temperature 256, Comp Out Temp is compressor exit temperature 264, Amb Temp is ambient temperature 212, Charge Cooler Eff is the efficiency of CAC, EGR Mass Fraction is EGR mass fraction 220, and EGR Cooler Out Temp is cooler for recycled exhaust gas outlet temperature 216.
Metal temperature module 268 determines metal temperature 272 based on intake temperature 208.Metal temperature 272 can correspond to the temperature being provided to one or more metal partss of the position of gas handling system in exhaust gas recirculation, such as, be connected to the metal EGR conduit of the position of gas handling system at egr system.Metal temperature module 268 is further based on predetermined temperature deviation determination metal temperature 272.Such as, metal temperature module 268 can arrange metal temperature 272 and equals intake temperature 208 and add predetermined temperature deviation or add predetermined temperature deviation based on intake temperature 208.Predetermined temperature deviation can be adjustable and such as can be set to be about 30 degree centigrades or other suitable temperature.
Reduce control module 276 and produce the first reduction heat command 156 selectively based at least one in intake temperature 208 and metal temperature 272.Be only exemplary, when intake temperature 208 and/or metal temperature 272 are greater than the first predetermined temperature, reduce control module 276 and first reduction heat command 156 to the first state can be set.Reducing control module 276 can need intake temperature 208 and/or metal temperature 272 to be greater than the first predetermined temperature at the first predetermined period before arranging the first reduction heat command 156 to the first state.
First predetermined temperature can be correctable and can be set to exceed its intake manifold and may melt and/or the temperature of loss structure integrity.Be only exemplary, the first predetermined temperature can be about 150 degree centigrades or other suitable temperature.
One or more remedial measure can be taked to reduce one or more temperature of intake manifold 14.Referring now to Fig. 2 and 3, such as, when first reduces heat command 156 in the first state, EGR control module 144 reduces target EGR aperture 148.When first reduces heat command 156 in the first state, EGR control module 144 can reduce target EGR aperture 148 to predetermined aperture.Predetermined aperture can be 0 percent open (to prevent EGR flow) and maybe can be greater than 0 percent and open (to allow predetermined minimum EGR flow momentum).
When intake temperature 208 and metal temperature 272 are less than the second predetermined temperature, reduce control module 276 and can reduce heat command 156 from the first status transition to the second state by first.Reducing control module 276 can need intake temperature 208 and metal temperature 272 to be less than the second predetermined temperature at the second predetermined period before the first reduction heat command 156 is transitted to the second state.
Second predetermined temperature is less than the first predetermined temperature.Be only exemplary, the second predetermined temperature can be about 140 degree centigrades or other suitable temperature.When first reduces heat command 156 in the second state, EGR control module 144 can increase target EGR aperture 148.
When intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined temperature, other remedial measure one or more can be taked to reduce intake temperature 208 and metal temperature 272.3rd predetermined temperature is less than the second predetermined temperature.Be only exemplary, the 3rd predetermined temperature can be about 130 degree centigrades or other suitable temperature.By this way, before EGR flow reduces, other remedial measure one or more can be taked to reduce intake temperature 208 and metal temperature 272.
Such as, when intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined temperature, the speed of electronic coolant pump (not shown) can be opened and/or increase to freezing mixture control module 160.The speed opened and/or increase coolant pump can increase cooling and therefore reduce intake temperature 208 and metal temperature 272.
Additionally or alternatively, when intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined temperature, freezing mixture control module 160 can open electric thermostat valve (not shown).Open thermostat valve can increase the cooling of intake manifold 14 and therefore reduce intake temperature 208 and metal temperature 272.
Additionally or alternatively, when intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined temperature, venetian blind control module 164 can open the Pneumatic shutters (not shown) of vehicle.When open, Pneumatic shutters allows air to enter engine compartment.Open Pneumatic shutters therefore can increase the cooling of intake manifold 14 and therefore reduce intake temperature 208 and metal temperature 272.
When intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined temperature, reduce control module 276 and can produce the second reduction heat command 280.When generation second reduces heat command 280, freezing mixture control module 160 can open electronic coolant pump, increases the speed of electronic coolant pump, and/or opens electric thermostat valve.Additionally or alternatively, when generation second reduces heat command 280, venetian blind control module 164 can open Pneumatic shutters.
Referring now to Fig. 4, present the flow chart describing the illustrative methods controlling intake temperature 208 and metal temperature 272.Control can from 304, and wherein gas temperature module 204 determines intake temperature 208.308, metal temperature module 268 determines metal temperature 272.The determination of intake temperature 208 and metal temperature 272 is described above.
312, reduce control module 276 and determine whether intake temperature 208 and/or metal temperature 272 are greater than the 3rd predetermined value.If 312 is yes, reduces control module 276 and produce the second reduction heat command 280, and control to proceed to 316.316, freezing mixture control module 160 can open electronic coolant pump, increases the speed of electronic coolant pump, and/or opens electric thermostat valve.Additionally or alternatively, 316, venetian blind control module 164 can open Pneumatic shutters.If 312 is no, control can terminate.3rd predetermined temperature is less than the first and second predetermined temperatures and such as can be about 130 degree centigrades or other suitable temperature.
Control to proceed to 320 after 316.320, reduce control module 276 and determine whether intake temperature 208 and/or metal temperature 272 are greater than the first predetermined temperature.If 320 is yes, reduces control module 276 and first reduction heat command 156 to the first state is set, and control to proceed to 324.If 320 is no, control can terminate.First predetermined temperature is greater than the second predetermined temperature, and it can be about 150 degrees Celsius or other suitable temperature.Reducing control module 276 can need intake temperature 208 and/or metal temperature 272 to be greater than the first predetermined temperature at the first predetermined period before arranging the first reduction heat command 156 to the first state.
When first reduces heat command 156 in the first state, EGR control module 144 reduces target EGR aperture 148 to predetermined aperture 324.Predetermined aperture can be 0 percent open (to prevent EGR flow) and maybe can be greater than 0 percent and open (to allow predetermined minimum EGR flow momentum).Although illustrate as end and discuss control, the example of Fig. 4 can be the explanation of a control loop, and control loop can perform with predetermined rate.
Referring now to Fig. 5, present the flow chart describing the illustrative methods that deactivation command reduces with the EGR reducing intake temperature 208 and metal temperature 272.Control can from 404, and wherein gas temperature module 204 determines intake temperature 208.408, metal temperature module 268 determines metal temperature 272.The determination of intake temperature 208 and metal temperature 272 is described above.
412, reduce control module 276 and determine that whether the first reduction heat command 156 is in the first state.If 412 is yes, control to proceed to 416.If 412 is no, control can terminate.416, reduce control module 276 and determine whether intake temperature 208 and metal temperature 272 are all less than the second predetermined temperature.If 416 is yes, control to proceed to 420.If 416 is no, control can terminate.Reducing control module 276 can need intake temperature 208 and metal temperature 272 to be less than the second predetermined temperature at the second predetermined period before the first reduction heat command 156 is transitted to the second state.
Second predetermined temperature is less than the first predetermined temperature and is greater than the 3rd predetermined temperature.Be only exemplary, the second predetermined temperature can be about 140 degree centigrades or other suitable temperature.
Reduce control module 276 420, first reduction heat command 156 to be reduced with the EGR flow reducing intake temperature 208 and metal temperature 272 from the first status transition to the second state with deactivation command.After this EGR control module 144 can increase target EGR aperture 148 selectively.Although illustrate as end and discuss control, the example of Fig. 5 can be the explanation of a control loop, and control loop can perform with predetermined rate.
Foregoing description only actually is exemplary and is not intended to limit the present invention, its application or use.Instruction widely of the present invention can be implemented in every way.Therefore, although the present invention includes concrete example, with reference to the accompanying drawings, specification, and the research of appended claim, because other amendment will become apparent, true scope of the present invention will not so limit.As used herein, term A, at least one in B and C should be understood to mean use non-exclusive logic OR(or) logic (A or B or C).Should be appreciated that when not changing principle of the present invention, the one or more steps in method can perform with different order (or) simultaneously.
In this application, comprise following definition, term module can replace with term circuit.Term module can refer to and belong to or comprise specific integrated circuit (ASIC); Numeral, simulation, or hybrid analog-digital simulation/digital discrete circuit; Numeral, simulation, or hybrid analog-digital simulation/digital integrated electronic circuit; Combinational logic circuit; Field programmable gate array (FPGA); The processor of run time version (share, special, or group); Store the storage (sharing, special, or group) of the code performed by processor; Other the suitable hardware component of the function provided a description; Or more the combination of some or all, such as, on core in system.
The term code more than used can comprise software, firmware, and/or microcode, and can refer to program, routine, function, classification and/or target.Term share processor comprises the single processor performed from some or all codes of multiple module.Term group processor comprises the processor performing some or all codes from one or more module together with additional processor.Term shared storage comprises the single memory stored from some or all codes of multiple module.Term group memory comprises the storage storing some or all codes from one or more module together with annex memory.Term memory can be the subset of term computer-readable medium.Term computer-readable medium does not comprise instantaneous electricity by medium transfer and magnetic signal, and therefore can think tangible and non-momentary.The unrestriced example of the tangible computer-readable medium of non-momentary comprises nonvolatile storage, volatile memory, magnetic store, and optical memory.
The equipment described in the application and method can be implemented partially or completely by the one or more computer programs performed by one or more processor.Computer program comprises the processor executable be stored on the tangible computer-readable medium of at least one non-momentary.Computer program can also comprise and/or rely on the data stored.

Claims (10)

1. an engine control system for vehicle, comprising:
First thermal module, it determines the gas temperature in the intake manifold of motor;
Second thermal module, it determines exhaust gas recirculatioon (EGR) conduit temperature be connected in intake manifold; And
EGR control module, it reduces the aperture of EGR valve when gas temperature and conduit temperature are greater than predetermined temperature.
2. engine control system according to claim 1, wherein predetermined temperature corresponds to the melting point of intake manifold.
3. engine control system according to claim 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module reduces the aperture of EGR valve to predetermined aperture.
4. engine control system according to claim 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature, EGR control module closes EGR valve completely.
5. engine control system according to claim 1, wherein when gas temperature and conduit temperature are greater than predetermined temperature at predetermined period, EGR control module reduces the aperture of EGR valve.
6. engine control system according to claim 1, wherein EGR control module reduces the aperture of EGR valve until gas temperature and conduit temperature are less than the second predetermined temperature, and described second predetermined temperature is less than the first predetermined temperature.
7. engine control system according to claim 6, wherein EGR control module reduces the aperture of EGR valve until gas temperature and conduit temperature are less than the second predetermined temperature at predetermined period.
8. engine control system according to claim 1, it comprises freezing mixture control module further, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described freezing mixture control module at least carries out opening in the speed of electronic coolant pump and the electronic coolant pump of increase, and described 3rd predetermined temperature is less than predetermined temperature.
9. engine control system according to claim 1, it comprises freezing mixture control module further, when at least one in gas temperature and conduit temperature is greater than the 3rd predetermined temperature, described freezing mixture control module opens electric thermostat valve, and described 3rd predetermined temperature is less than predetermined temperature.
10. an engine control for vehicle, comprising:
Determine the gas temperature in the intake manifold of motor;
Determine exhaust gas recirculatioon (EGR) conduit temperature be connected in intake manifold; And
The aperture of EGR valve is reduced when gas temperature and conduit temperature are greater than predetermined temperature.
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